On 2012-03-16 10:27 AM, Rick Karlquist wrote:
> Pete Smith N4ZR wrote:
>> I wonder if anyone has considered building Breakall et al's design for a
>> massively shortened vertical antenna - 0.05 wavelengths, according to
>> the technical paper at
>> http://www.kintronic.com/resources/technicalPapers/2.pdf. I originally
> This idea has never made sense to me. Because of symmetry, the
> voltages and currents of the four elements should be identical.
> Therefore, I should be able to connect the bottom ends of the
> elements together without affecting anything. Similarly, I should
> be able to connect the tops of the elements (at the bends)
> together. Having done this, I now have a top loaded cage vertical.
> It may indeed work, and it may indeed compare favorably to a 1/4
> wave vertical. However, there is nothing new here. Am I
> missing something?
>
> Rick N6RK
>
I don't think you're missing anything at all. Matching with multiple
1/4 wavelength lines can be done by just paralleling them to get the
desired effective Zo (but a hairpin match is even simpler, and may have
less loss and wider bandwidth). The ground losses are the same as any
short, top-loaded antenna since the ground currents are the same.
73, Terry N6RY
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